Răspuns :
a+123=600, a=600-123=477
a-428=657, a=657+428=1085
ax3=690, a=690 : 3= 230
a:2=148, a=148x2=296
a+123=600
a=600-123=477
a=477
a-428=657
a=657+428
a=1185
a×3=690
a=690:3
a=230
a:2=148
a=148×2
a=296
a=600-123=477
a=477
a-428=657
a=657+428
a=1185
a×3=690
a=690:3
a=230
a:2=148
a=148×2
a=296